function RandomNumber() 
{
  var today = new Date();
  var num= Math.abs(Math.sin(today.getTime()/1000));
  return num;
}

function RandomGraphics() 
{
  var x = RandomNumber();

if (x > .00) 
{document.write("<A HREF='http://www.xii-online.com/libri/frankmiller' target'_blank' rel='nofollow' title='Matite su Hoolywood - Il Cinema di Frank Miller'><img src='http://www.latelanera.com/images/2009/banner-miller-468.gif' border=0 target=_new alt='Matite su Hoolywood - Il Cinema di Frank Miller' width=468 height=60 /></a>"); return; 
}

}

RandomGraphics();